There was a few times they almost curse.
On one Muppets Tonight skit, someone had a gun and said it had a kick like an a...... (booom!)
Then there was Dog City when the female dog sang
"I'll be his..." (Rowlf hits a loud, sour note and adds, "Welcome to family programming"
Of course, if anyone wants to debate, Pepe did say, "I have good news, Okay! Unless you're a bad lady, then it sucks, okay!"
Now, in my opinion "sucks"{ is not a swear or curse, unless you ad a certain word that rhymes with "Nick"
It could simply mean, it sucks eggs or something.
Plus, I have heard this word numerous times on Kid's shows (one time on Peper Ann! "Peppy! I thought you said Drama sucked!")
If creature shop creatures count (which they probably don't) Raphael said "D**N" numerous time in the Ninja Turtle movie!